Pintocrazed, your description matches what is shown in the 1973 Ford manual for factory installed AC. The dealer installed AC in my 71 was like pictured by 74 Pintowagon except it was located under the radio and on top of the transmission tunnel. The dealer installed AC left the factory heating system as is, and added the AC as a stand alone system (much quicker install). From the 73 manual, the factory AC has these features that distinguish it from dealer installed: heating and cooling controls are on the same dash panel instead of separate, most damper control is via pneumatics instead of all cables, the one heat and cool blower motor is under/in the dash while the dealer has a separate AC blower motor under the dash with the heater blower motor protruding through the fire wall, a pneumatic heater water control valve is located on the firewall while the dealer AC has no heater water valve, the AC expansion valve is located on the fire wall instead of under the dash with the dealer unit. To confuse things a little more, I have seen Ford dealer install AC with a Ford emblem and after market retrofit AC units form Mark-IV if memory serves right.